A corrosion protective coating (22) for the root (18) of a superalloy turbine blade (10) comprises a platinum enriched outer layer (24) on the root (18) of the turbine blade (10) and an alumina layer (26) on the platinum enriched outer layer (24). The platinum enriched layer (24) comprises platinum enriched gamma prime phase (36) in a platinum enriched gamma phase (34) matrix. The corrosion protective coating (22) provides protection against low temperature corrosion, high temperature corrosion and oxidation. The platinum enriched layer (24) is provided with a compressive stress to improve fatigue life.
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